Waveguide bandpass filter having a non-contacting printed circui

Details Waveguide bandpass filter having a non-contacting printed circui Waveguide bandpass filter having a non-contacting printed circui

1989-11-06

1991-02-05

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333248, H01P 1207

Patent

active

049908707

ABSTRACT:
A waveguide bandpass filter employs a waveguide section and a printed cirt filter assembly having a dielectric substrate positioned in the waveguide between the narrow walls thereof and a row or array of half-wavelength conductive metal plate elements lying in a surface plane of the dielectric substrate that is oriented substantially parallel to narrow walls and orthogonal to broad walls of the waveguide. The half-wavelength conductive metal plate elements, defining a parallel resonant array, are spaced in non-conductive relation from one another and from the broad and narrow walls of the waveguide so as to divide and transform a dominant waveguide propagation mode into a transformed propagation mode that approximates upper and lower microstrip sections interconnected by a metallic conductor. The filter also includes a pair of elongated foam dielectric bodies disposed in the waveguide and mounting therebetween the dielectric substrate and half-wavelength conductive plate elements thereon, and a pair of quarter-wavelength conductive metal plate elements on the dielectric substrate which are conductively connected to outermost ones of the half-wavelength conductive plate elements for defining impedance matching transformers adjacent input and output ends of the waveguide.

REFERENCES:
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patent: 3754198 (1973-08-01), Anghel
patent: 4028650 (1977-06-01), Konishi et al.
patent: 4188594 (1980-02-01), Bongianni
patent: 4233579 (1980-11-01), Carlson et al.
patent: 4264881 (1981-04-01), De Ronde
patent: 4521755 (1985-06-01), Carlson et al.
patent: 4539490 (1985-09-01), Ariizumi et al.
patent: 4540960 (1985-09-01), Giordano
patent: 4873501 (1989-10-01), Hislop
patent: 4897623 (1990-01-01), Reindel

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